.TH socket_mcjoin4 3
.SH NAME
socket_mcjoin4 \- join a multicast group
.SH SYNTAX
.B #include <socket.h>

int \fBsocket_mcjoin4\fP(int \fIs\fR,const char \fIgroupip\fR[4],const char \fIinterface\fR[4]);
.SH DESCRIPTION
socket_mcjoin4 joins the IPv4 multicast group \fIgroupip\fR on \fIinterface\fR.

If something goes wrong, socket_mcjoin4 returns -1, setting errno
appropriately.
.SH "SEE ALSO"
socket_mcleave4(3), socket_mcjoin6(3), socket_getifidx(3)
